message.h

微内核软实时操作系统

/*
 * Copyright (c) 2005-2007, Kohsuke Ohtani
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the names of any co-contributors 
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _MESSAGE_H
#define _MESSAGE_H

#include <sys/types.h>
#include <prex/prex.h>

/*
 * Message header
 *
 * The ID of send task is automatically filled by the kernel
 * in msg_send() call. So there are no need to set it by the
 * sender task. The receiver task can always trust the task ID
 * in all messages.
 */
struct msg_header {
	task_t	task;		/* ID of send task */
	int	code;		/* Message code */
	int	status;		/* Return status */
};

/*
 * Generic message
 */
struct msg {
	struct msg_header hdr;	/* Message header */
	int	data[4];	/* Integer data */
};


/*
 * Standard messages
 */
#define STD_NULL	0x00000000
#define STD_VERSION	0x00000001
#define STD_DEBUG	0x00000002
#define STD_STATUS	0x00000003
#define STD_SHUTDOWN	0x00000004
#define STD_POWER	0x00000005

#endif /* !_MESSAGE_H */